I'm sure this will hurt him. He normally has high approval ratings, but with the election in November, this will be bad. He's also likely to take a lot of blame if SF loses the 49ers, plus he's got his spokesman who just got busted posing as someone else on a website posting pro-Newsom comments. SF also had to cancel its Olympic bid as a result of the 49ers announcement to pull out of the new stadium deal. It's a longshot SF would have won the Olympics, anyway. But the hopes are dashed.
http://sfgate.com/cgi-bin/article.cgi?f=/c/a/2007/02/01/BAGB8NSRUC1.DTL